Legally land aquatic reptile losing leg (5)
I believe the answer is:
terra
'legally land' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for terra that I've seen before include "Legally land" , "Centre" , "-- Firma; -- incognita" , "Land (Latin)" , "Dry land" .)